Ultra-sensitive refractive index sensor based on extremely simple femtosecond-laser-induced structure

Chen, Pengcheng; Shu, Xuewen; Cao, Hanyuan and Sugden, Kate (2017). Ultra-sensitive refractive index sensor based on extremely simple femtosecond-laser-induced structure. Optics Letters, 42 (6), pp. 1157-1160.


We demonstrate here an extremely simple, compact and robust RI probe sensor based on a femtosecond-laser induced refractive-index-modified-dot (RIMD) fabricated near the end face of a single mode fiber. The RIMD and the fiber end face form a Fabry-Perot interferometer, which is highly sensitive to surrounding RI. The fabrication process of the RIMD involves only one step and takes ~0.1s, which is extremely short compared with other techniques. The proposed sensor exhibits an ultra-high sensitivity of ~2523.2 dB/RIU at an RI of 1.435, which is 1-2 orders of magnitude higher than that of the existing intensity-modulated RI sensors. Moreover, the proposed sensor has the distinct advantages of compact size (~50 µm), easy fabrication and no temperature cross-sensitivity. The advantages of the device make it a promising candidate for applications in designing highly sensitive sensors in biochemical and environmental measurement field.

Publication DOI: https://doi.org/10.1364/OL.42.001157
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
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Additional Information: © 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Uncontrolled Keywords: fiber optics sensors ,microstructure fabrication,interferometry,Fabry-Perot,all-optical devices,Atomic and Molecular Physics, and Optics
Published Date: 2017-03-15


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